function getDate(expriedays = -30){
    var exdate = new Date();
    exdate.setDate(exdate.getDate + expriedays);
    return exdate.toGMTString();
}

export function getCookie(c_name){
    var c_start, c_end;
    if(document.cookie.length > 0){
        c_start = document.cookie.indexOf(c_name + '=');

        if(c_start != -1){
            c_start = c_start + c_name.length + 1;

            c_end = document.cookie.indexOf(';', c_start);

            if(c_end == -1) c_end = document.cookie.length;

            return unescape(document.cookie.substring(c_start, c_end));
        }
    }

    return '';
}

export function setCookie(c_name, value, expriedays){
    document.cookie = c_name + '=' + escape(value) + ';expires=' + getDate(expriedays);
}

export function delCookie(c_name, value){
    document.cookie = c_name + '=' + escape(value) + ';expires=' + getDate();
}

